[catalog] split builtin.rs into per-schema submodule files

src/compute-client/src/logging.rs

@@ -206,7 +206,7 @@ impl LogVariant {
     ///
     /// This types need to agree with the values that are produced
     /// in `logging::compute::construct` and with the description in
-    /// `catalog/src/builtin.rs`.
+    /// `catalog/src/builtin/mz_introspection.rs`.
     pub fn desc(&self) -> RelationDesc {
         match self {
             LogVariant::Timely(TimelyLog::Operates) => RelationDesc::builder()

src/environmentd/tests/sql.rs

@@ -3760,7 +3760,7 @@ async fn test_cancel_linearize_read_then_writes() {
     handle.await;
 }
 
-// Test that builtin objects are created in the schemas they advertise in builtin.rs.
+// Test that builtin objects are created in the schemas they advertise in the builtin submodules.
 #[mz_ore::test(tokio::test(flavor = "multi_thread", worker_threads = 1))]
 #[cfg_attr(miri, ignore)] // too slow
 async fn test_builtin_schemas() {
@@ -3795,7 +3795,7 @@ async fn test_builtin_schemas() {
         assert_eq!(
             builtin_schema,
             Some(&schema.as_str()),
-            "wrong schema for {name}, builtin.rs has {builtin_schema:?}, database has {schema}"
+            "wrong schema for {name}, builtin submodules have {builtin_schema:?}, database has {schema}"
         );
     }
 }